Deep-well pump



March .10. l 925.

A. O. ZINN DEEP WELL PUMP Filed Jan. 10, 1924 INVENTOR. Ary, a, ZW BY d/u/ A TTORNEYS y Patented Mar. 10, 1925.-

UNITED STATES .ARGUS O. ZIINN, 0F LOS ANGELES, CALIFORNIA.

DEEP-WELL PUMP.

Application filed January 10, 1924. Serial No. 685,308.

TQ all'wom t may concern.'

Be it known that I, Anous O. ZINN, a citizen of the United States, and resident of Los Angeles, county of 4Los Angeles, State of California, have invented new and useful Tmprovements in a Deep-Well Pump, of 4which the following is a specification.'

This invention relates to a pump adapted for use in wells wherein there is an appreciable stretch in the piston rod on its operating stroke. Pumps of this character do not lift a volume of liquid commensurate with their capacity, because of the failure of the piston to travel a distance equal to the travel of the piston rod at the surface or atthe operating head. There is also slapping of the rod, and crystallization due to the alternate expansion and contraction of therod. 'This weakens the rod and may cause breakmg. l

The objects of this invention are rst, to provide a pump having means to produce and maintain an initial stretch in the pump rod; second, to provide and maintain al confined column of liquid thereby providing in eifect a rigidpiston rod; third, to provide a valved piston of the characteristics before specified and having a tubular rod for the discharge of the pumped liquid therethrough; and fourth, t0 provide a pump of the characteristics before specified and having a uniow of liquid.

These objects together with other objects and corresponding accomplishments are obtained by means of the embodimentv of my invention illustrated in the accompanying drawing. in which: v v

Fig. 1^ shows the upper or operating end of a pump, the view being in axial section; and Fig. 1B shows in axial section* .the bottom of the pump. i

Referring more particularly to the drawing, the usual conductor casing extending into the hole is indicated by 2. 4Disposed therein and extending therethrough is a string of casing 3, which is the usual water string. sealed at the bottom by a bond of ce ment 4. Disposed within the water string and extending therethrough is an oil string 5 extending into the oil strata and perforated to admit oil thereto.' Disposed withinl the upper portion of the oil string is a jacket casing 6, which has disposed therein pump 'tubing 7. The water string has a casing clamp 8 mounted upon the top thereof to support the oil string, and mounted upon the oil string is a casing clamp 9, upon which rests the collar 10 of the pump jacket. The usual ump barrel 11 is secured to the bottom o the pump tubing. A valve seat at the bottom of the pump tubing has mounted thereon a standing valve 12 of a well known type. The standing valve is providedv with the usual garbut rod 13. The space between the pump tub1ng7 and the jacket 6 is closed at the top and bottom. Ports 14 serve forcommunication between the jacket space and the interior of the pump tubing.

An upperpiston 15 is slidingly mounted Agenerally by 22. This head serves to reciprocate the piston. Secured to the lower end of the pump rod tubing is a'valved working piston 23. slidingly mounted in the pump tubing. Connected to the pump jacket and communicating therewith is pipe 24 shown with a pressure guage 25 connected thereto. A valve 26 controls communication between piping 24 and aexible pipe 27 leading'to a means for maintaining the liquid under pressure.

An incompressible liquid is forced into 'the jacket 6 through pipe-24 so that it fills the space in the jacket and the annular space betweenthe pump rod tubing 17 and the pump .tubing 7. Pressure is exerted uponthe lower f face of ston 15 and the upper -face of lower working piston 23. This pressure is made suici'ent to stretch and elongate the pump rod tubing, thereby making the latter The liquid maintained under pressure in the space between the pump rod tubing and the pump tubing will take the strain exerted on the downward stroke.

On the downward stroke liquid below the vlower piston is forced upwardly through the valve port therein, the standing valve closing. On the upper stroke, the column of liquid within the pump rod tubing is lifted, the displacement of the lower piston drawu ing oil into tubing.

the lower'portion of the pump What ,I claim is: n

1. A pum having a pump barrel, a Work ing piston disposed in saidbarrel, a relatively long pistonrod secured thereto, an

B upper piston secured to said rod adj acent the top thereof, pumpltubing in which said upper piston operates extending to said Working barrel' to form a closed chamber, and a liquid confined in said chamber under l@ pressure.

2. A pump having a pump barrel, a recipn rocable piston therein, a relatively long` tubular piston rod for the discharge of liquid being pumped, pump tubing= extendingupwardly froml said barrel and V`surrounding said rod to form a closed chamber, and a liquid in said chamber under pressure and hydrostat'ically acting upon said rod so? as to provide and maintain a tension in said piston rod.,

3. A pump having a pump barrel, a reciprocable piston therein, a relatively long tubular piston rod for'the discharge of liquid being pumped, pump tubing extending up- Wardly from said barrel and surroundm said rod toform a closed chamber, a liqui 'confined in said chamber-under pressure so as to stretch said piston rod, and means to introduce to and maintain said liquid under v pressure in said chamber.

4., A pump having a pump barrel, a reciprocable working piston therein, a relatively long tubularpiston rod for the discharge of liquid' being pumped, an upper piston mounted on said rod,pump tubing extend ing upwardly from said working barrel and surrounding said rod and upper piston to form a closed chamber.

5. A pump having. a pump barrel, a.

valved reciprocable working piston therein, a relatively long tubular piston rod for the discharge ofli uid being; pumped, an upper piston mounted on /said rod, pump tu lng 'extending upwardly from said Working barrel and surrounding said rod and upper piston to form a closed chamber, a liquld conined in said chamber under pressure so as to stretch said piston rod, and means to intro-1v duce to and maintain said liquid under pressure 1n saidy chamber.

6. A -pump having a pump barrel, ak

valved. reciprocable piston therein, a relatively long tubular piston rod for the discharge of liquid being pumped, pump tubin extending upwardly from said barrel an ,surrounding said rod to form a closed chamber, a liquid confined-in said chamber under pressure so as to stretch said Apiston rod, 

